The Bay County Building is a government building located at 515 Center Avenue in Bay City, Michigan. It was listed on the National Register of Historic Places in 1982. Bay County was founded in 1858. The first courthouse was a small clapboard structure at the foot of Fourth Street in Bay City. In 1867, this had grown too small, and a new courthouse w…The Bay County Building is a government building located at 515 Center Avenue in Bay City, Michigan. It was listed on the National Register of Historic Places in 1982. Bay County was founded in 1858. The first courthouse was a small clapboard structure at the foot of Fourth Street in Bay City. In 1867, this had grown too small, and a new courthouse was erected at this location, opening in 1868. By the late 1920s, however, Judge Samuel G. Houghton was campaigning for a new courthouse. In 1931, voters approved, and in 1932 the county Board of Supervisors selected local architect Joseph C. Goddeyne to design the building and Bay City Stone Company to construct it. The project began in 1932 with the clearing of the site and the demolition of the old courthouse. The cornerstone for the new courthouse was laid on April 13, 1933. The building was completed in 1934. The building is still used by the county.